Improvement in stop-watches



U. A. JUVET. Stop-Watches.

No. 213,048. Patented Mar. 11,1879.

" R5. FHOTOLITHOGRAFHER, vusumsmn, 9 C

UNITED STATES PATENT OFFICE.

'ULYSSES JUVET, ()F GLENS FALLS, NEv T YORK.

IMPROVEMENT IN STOP-WATCHES.

Specification forming part ofLetters Patent No. 213,048, dated March 11,187i) application filed July 18, 1878.

To all whom it may concern:

Be it known that I, ULvssns A. JUvET, ot' Glens Falls, in the county of\Varren and State of New York, have invented a new and usefulImprovement in Stopatches, of which the following is a specification:

The object of my invention is to dispense with the additional movementcommonly used to run the independent second-hand in stopwatches, and toobtain an independent secondhand by so mounting the secondhand that itmaybe detached from its running-pivot and instantly stopped, or maybe asreadily replaced in connection with the pivot so as to run therewith. Tothis end I attach the second-hand to a split cannon fitting on the pivotof the second-wheel, so as to be driven byhard friction, and having abaseflange, which is engaged between two springs, which may be raised ordepressed by the action either of a push-pin in the pendant, or a slidein the edge of the case, or a lever within the case, as preferred, andwhen raised will remove the cannon or sleeve from the friction of thepivot and hold it still, or when depressed will restore the cannon tofrictional connection with the pivot and then release it, so that thesecond-hand may partake of the motion of the pivot.

My invention further consists in mounting the second-hand of a watch ona pivot or axis made in two parts, so as to render it detaclr able, ashereinafter described.

In order that my invention may be clearly understood, I will proceed todescribe it with reference to the accompanying drawings, in which-Figure 1 is a plan view of the movement. Fig. 2 is a section on the line2 2, looking in the direction of the arrows, and showing thesecond-wheel cannon in frictional connection with the pivot of therunning wheel. Fig, 3 is an elevation of the springs detached. Fig. 4Lis an elevation of the lever employed under the present illustration tomove the carriage which raises the springs or permits their descent.Fig. 5 is a section, showing the second-hand cannon elevated out offrictional connection with the pivot and held by the springs.

A and 13 are springs, attached by screws a b to the dial-plate 1, and,when free, pressin g down on said plate by their own resilience.

The free ends of the said springs are perforated, so as to encircle thepivot c of the second-hand wheel E, and receive between them the flanged of a split cannon, D, which carries the second-hand S, and whendepressed, as shown in Fig. 2, runs with the pivot 12 by hard friction.

To raise the springs when. required to remove the cannon from frictionalconnection with the pivot, I employ a carriage, 0, having a stud, 0,which projects beneath the springs A B. A spring, F, throws the carriageback, so as to permit the springs A B to descend.

The carriage may be driven in by a simple sliding movement by means of apush-pin in the pendant.

In the present illustration 1 have shown it as an L-shaped lever,fulcrumed at g, and actuated by a lever, H, working on afulcrumserew,2', and provided with a stud, h, which bears against the inclined backof the carriage 0, so as to throw it forward when the lever H is movedand slips just beyond the projecting angle of the L-shapcd carriage, soas to lock it in its forward position.

The lever H works within a notch, in the margin of the dial-plate, theends of which notch form stops to limit the motion of the lever ineither direction.

The peculiar forms'of the respective springs A B, to adapt them to raiseand lock the hand S when the carriage C is moved forward, or to depressand release it when the carriage is moved back, are best shown in Fig.The spring A is bent downward toward its extremity, and interposedbetween the cannonflange d and the plate P, the inclined shoulder 1forming a bearing against which the stud c of the carriage engages, soas to throw up the spring and thereby raise the hand.

The spring B, which acts, in combination with the spring A, as a clampwhen the cannon is elevated, and is also employed to depress the cannonand restore it to frictional connection with the pivot, surrounds thecannon above its flange cl, and has two shoulders, 2 S, with which thecai'riagestud c engages in its forward and backward movements, in eachcase raising the spring olf the flange (l; but the shoulder 2 may bedispensed with.

By the invention above described a common to relieve it from hardfrictional contact with the pivot e, and clamping it by its flange 6?,so as to hold it still while the pivot continues to run. When thecarriage is retracted its stud c recedes from the shoulders 1 and 2 ofthe respective springs, causing the springs to descend, and the upperone, B, to press the cannon D-firmly down on the pivot 6, so that itwill be driven thereby; and'the continued movement of the stud brings itagainst the shoulder 3, so as to raise the spring B alone, and thusremove it from frictional contact with the cannon-flange d.

It is not material to the invention whether the spring B is providedwith a shoulder, 2,

to receive the forward impact of the stud 0. If this shoulder isdispensed with the spring is raised by the same movement of the stud,acting through the medium of the spring A and flange d.

Having thus described my invention, the

following is what I claim as new therein and desire to secure by LettersPatent:

1.. An independent second-hand connected to its running-pivot c by aflanged cannon, D d, in combination with a pair of springs or levers,AB, operating in the manner described, to disconnect the hand from itsrunning-pivot and replace it in connection therewith.

2. In combination with the running-pivot e and the detachable cannon D,carrying the second-hand S, the springs A 13, having shoulders 1 3, andthe slide (J,-a'cting on said shoulders to .detach and lock or replaceand re- I lease the second-hand, as described.

ULYSSES A. J UVET.

Witnesses:

E. '1. J oHNsoN, O. R. SUMMERs.

